Less-Than-Full Tray —A tray that contains mail for a single destination that was not preceded by a full tray for that destination. Less-than-full trays may be prepared only if permitted by the standards for the price claimed.

 

Letter —According to the Private Express Statutes, a message directed to a specific person or an address and recorded in or on a tangible object. Also a shortened way to refer to letter-size mail.

 

Letter-size mail —A mail processing category of mailpieces, including cards, that do not exceed any of the dimensions for letter-size mail (i.e., 11-1/2 inches long, 6-1/8 inches high, 1/4 inch thick).

 

Library Mail —A subclass of Package Services for items sent to or from or exchanged between academic institutions, public libraries, museums, and other authorized organizations. Books, sound recordings, academic theses, and certain other items may be mailed at the Library Mail price if properly marked.

 

Line-of-travel (LOT) Sequence —A sequence required for some carrier route prices in which mailpieces are arranged by ZIP+4 codes in the order in which the route is served by the carrier. The mailpieces are sequenced in delivery order.

 

LTR (or LTRS) —An abbreviation used on mail tray labels that identifies the contents as letter-size pieces